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PUBLIC fTEALTH SERVICES ,o .o <br /> SAN JOAQUIN COUNTY `1 <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 +`.Fd <br /> 209/468-3420 O <br /> OCT 2 9 1997 <br /> THOMAS O'NEILL & ANDREW HYDUKE <br /> PO BOX 923 <br /> STOCKTON CA 95201 <br /> RE: Valley Motors SITE CODE: 1166 <br /> 800 E. Main St. <br /> Stockton, CA., 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD), <br /> has reviewed the "Work Plan for Further Assessment" received October 23, 1997 and <br /> has the following comments. <br /> Since the March 25, 1997 PHS-EHD correspondence sent to you by Michael Infurna <br /> with comments by the Technical Review Committee, there have been some <br /> modifications to the groundwater investigation procedures at contaminated underground <br /> tank (UGT) sites. PHS-EHD will require the following modifications to your recently <br /> submitted workplan. <br /> UGT sites with contaminated groundwater will be required to investigate soil and <br /> groundwater conditions known to exist during the drought/historically recorded deepest <br /> depth to first groundwater. San Joaquin County Floods Control maps indicate that <br /> during the Fall of 1979, the depth to water beneath this site was recorded at 75 feet <br /> below ground surface. The proposed confirmation soil boring or monitoring well <br /> installation should include the collection of both soil and discreet groundwater samples <br /> from this depth. If the groundwater sample from this depth appears to be contaminated, <br /> PHS-EHD will require that a monitoring well be installed. The well should be <br /> constructed with a short (<10 feet) screened interval at this depth. <br /> Please sample the "deep" groundwater for Total Petroleum Hydrocarbons as Stoddard <br /> Solvent, Diesel, and Gasoline, BTEX, chlorinated solvents, and the oxygenates listed in <br /> the enclosed policy update. If the groundwater at the current vadose/saturated zone <br /> interface also appears contaminated, either another monitoring well is to be placed in <br /> this immediate area ("clustered") or the deep well construction should be designed to <br /> contain two (2) casings ("nested"). <br /> Selected soil samples should be analyzed for conductivity, bulk density, porosity, <br /> moisture content, and bacteriological plate count, as well as the constituents listed for <br /> the groundwater noted on the next page. The sample selection will be made by PHS- <br /> EHD staff during the field inspection. <br /> A Division of San Joaquin County Health Care Services <br />